Stoking mechanism.



H. L. MOORE.

STOKINGMECHANISM.

APPLICATION FILED JUNE 19, 1916.

1,267,439, I Patented May 28, 1918.

IN l/EN TOR WITNESSES.

A TTORNEY waver LEE eta-43o. Y

stamens]. of Lea-as Patent.

WILLIAM C. 'QTRIIE, OF PITTSBURGH, PENNSYLVANIA.

Patented May as; 1918.

Application filed .Tune 19, i916. erial No. 104,i2 8.

Tool? whom concern, I 'Be it known. that I, HARVEY r h oonn, residiiigat Pittsburgh in the county of Allegheny and State of Pennsylvania, acitizen of the United States, have invented or discovered certain new and useful Improvements in Stoking hlechanism, of which improvement the following is a specification.

: In thetype of stoker employingaplunger for forcing the coal into the fire chamber, it is undesirable that the plunger should fit so closely in the shell in which it reciprocates, as to prevent the entrance of dust between the plunger and shell. As the plunger reciprocates, considerable quantities of dust are worked back to the rear of the plunger, and either drop into the fire room or if the rear or the outer end of the shell is closed, will soon accumulate in sufficient amount to prevent the operation of the plunger.

The invention described herein has for its object the provision of means for preventing wholly or to a large extent the movement of dust to the rear of the plunger. The invention is hereinafter more fully described and claimed.

In the accompanying drawings, forming a part of this specification Figure 1 is a sectional elevation of a portion of a stoking mechanism embodying my improvement, Fig. 2 is an elevation of a plunger constructed in accordance with my invention; Fig. 3 is a sectional view on a plane indicated by the lines 38 Fig. 2, and Fig. 4; is a view similar to Fig. 2 illustrating a modification of the improvement.

In the practice of the invention the plun-' ger 1 is reciprocated by any suitable means, transverse to the lower end of the hopper 2 to force the coal into the opening 3 leading to the fire chamber. When in operative posi tion the plunger rests within a shell 4, which serves as a guide for the plunger, when reciprocated. It is undesirable for several reasons to construct the plunger so as to fit closely in this shell, and hence fine dust will pass in between the shell and plunger. The reciprocation of the plunger will move the dust back and forth, but as the fuel in front of the plunger will prevent to some extent the movement of the dust forward toward the fire-box, the larger per cent. will be worked to the rear of the plunger or to the left in Figs. 1 and 2 and finally drop into the fire room; if the rear end is closed the accumulateddust will prevent the operation of plunger.

,In order to nsure the movement of all or the major part of the dusttoward the firebox, the plunger is provided with one or mereoo s.5,.W d may .e te de y around the plunger as shown in Fig. 51; or may extend about one-half around a portion of the periphery on .the underside otthe plunger, as shown in Figs. 1, 2 and 3. These grooves are made with the rear wall a at an angle, preferably a right angle, to the axis of the plunger, while the front wall I) is made so as to be inclined forward in the direction of movement. When the plunger is reciprocated forwardly or to the right, the abrupt shoulder a will tend to force the dust contained therein toward the fire box, but when the plunger is moved to the reai or open end of the shell or cylinder the inclined wall 6, bearing on the dust will tend to raise the plunger permitting it to over ride the dust and the crowding of the dust from the grooves into the sphere between the plunger and shell. It will be found that by this construction, very little dust will be worked to the rear of the plunger and hence she fire-room will be practically free from ust.

It will be readily understood by those skilled in the art that as long as the wall a of the groove has a greater inclination to the axis of the plunger than the wall 7), the movement ofthe plunger will cause a larger percentage of the dust to be moved toward the fire-box. It is preferred that the grooves should be arranged adjacent to the front end of the plunger, so that dustwill be excluded from between the main portion of the plunger and shell, and such porgions will not be subject to abrasion by the ust.

If desired the grooved portion of the plunger, may be so constructed as shown in Fig. 4 as to provide greater clearance between the under side of the plunger and the shell, as shown in Fig. 4-. Such construction will facilitate the movement of dust from the groove or grooves on the rearward movement of the plunger.

I claim herein as my invention:

1. In a stoking mechanism the combination of a hopper, a plunger guiding shell arranged at an angle to the movement of the fuel in the hopper, and a reciprocating plunger for forcing fuel into the fire-box and movable back and forth in the shell, said plunger being provided in its underside with v ranged at an angle to the movement of fuel through the hopper, and a reciprocating plunger for forcing fuel into the fire-box said plunger being provided With a groove in its under side having its rear'wall in a plane at an approximately right angle to the axis of the plunger, and its front Wall in a plane at an angle less than a right angle to the axis of the plunger.

3. In a stoking mechanism the combination of a hopper, a plun 'er guiding shellarranged at an angleto the movement of the fuel in the hopper, and a reciprocating plunger for forcing fuel into the fire-box and movable back and forth in the shell,said plunprovided with a groove having its rear Wa at a greater inclination than its front, to the axis of the plunger, a section of the grooved portion of the plunger being formed in the arc of a circle of less diameter than that of other portions vof the plunger.

In testimony whereof I have hereunto set myhandl p p 7 -HARVEY LEE MOORE. 5.

. Witness:

ALIcE A. I

f q opies o f this patent ruay be obtained for five centsjeacmby addressing the Commissioner of.- Patents, l Washington, 1'). G. 

